Optos P200TxE, User Manual, Page: 45 / 84

Chapter 4 - Capture images
4.8.2.1 Capture scans quickly and recapture if necessary
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It is better to capture and then recapture, than delaying and risking the patient's eye drying.
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The benefit of recapturing is that you can ask the patient to sit back and rest a few minutes, or blink
between captures.
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On the next approach, the auto-routines will recall settings, reducing alignment time and the
patient's eye drying.
4.8.2.2 Using the auto-routines
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The auto-routines set the position, depth and focus.
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Do
NOT
touch the screen while the auto routines are running.
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After the auto-routines have run, you may make manual alignment adjustments. Always pause to
allow each individual adjustment to take effect before making further changes.
4.8.2.3 Live OCT positioning
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Use individual presses on the hand control (see Using the hand control on page 33).
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Ensure the live OCT feed is centered and level (see Using the hand control on page 33).
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If there is signal loss on the edges, it could be that the patient's pupil is no longer aligned. Select
Cancel and repeat the alignment process.
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Adjust the position of the OCT to the upper half of the window, but not touching the top of the view.
The higher the position the higher the sensitivity.
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Adjust the focus control to increase the signal strength (see Using the hand control on page 33).
Multiple or extended focus adjustments should not be required.
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If the auto-focus result is not close to ‘best’ then use the drop down control to Redo auto-focus .
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Adjust the focus to increase SNR using only a very few individual clicks on the + / - keys. Target live
SNR of 8 or better where there is no opacity.
4.8.2.4 Minimizing eye dryness
As with all OCT devices, the captured scans will be poorer if the patient’s eye is dry. The patient's eye may
dry out during alignment. The workflow allows several opportunities for the patient to rest and blink
normally during the session. Ask the patient to blink or rest their eyes at the following points in the workflow.
The patient should remain in the aligned position, when blinking. Lubricating eye drops can be very helpful,
especially in older eyes.
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Before capturing the SLO image.
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After capturing an SLO image.
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Before setting up an OCT scan.
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Before capturing an OCT scan.
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After capturing an OCT scan.
Ask the patient to avoiding blinking at the start of the auto-routines. A few seconds after the auto-routines
have started the patient may blink occasionally without impacting the OCT setup.
4.8.3 How to capture an OCT follow-up scan
You can follow-up previous scans.
Part Number: G110230-003-ENG Page 45 of 84
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